Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f415aa3b46c197…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 23:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b9af69b1f95cdddf360bb33e1374bfd7 SHA-1: eac80409ca5c3fcce5c6fbf895e00a92e83c6b36 SHA-256: 76f415aa3b46c197ebd5cf50f193103f124a60bd92abfca152f1b663978185d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=nova+launcher+for+android+11 PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2da55b72f3a61813e8b5cf0aa58cd079/xexirerovimifokila.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210913214707.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/jogadesovawigetun.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/kefoxibebuzenekugem.pdfIn PDF document text
    • http://mobilenmr.com/files/files/11664359140.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wopiwoworumogibi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133e890d49e5---logupadotadifazer.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/11471454327.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/dumarotir.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380088f0018---91415177921.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/renonexagezetotekelik.pdfIn PDF document text
    • https://conrays.ru/f/data/87558581887.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mexaderisolojibomixiso.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631878402_58937734d4.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/56933238038.pdfIn PDF document text
    • https://satesayap.com/contents/files/rokimupakiluzasosedupeje.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89c9581f0---tubajemojejumamuz.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/gexuriborus.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/74887901420.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/80486112707.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/pobisewitibelidijerex.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/lakekugirovuv.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/10493037367.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/37749038022.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 10500 bytes
SHA-256: 70a5b82e9619de20063721eacef26ab2b648df477c1e8519c67649b48d5a1abd
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 16632 bytes
SHA-256: a7430af5cb901e6785f4f385fa0789ef4332370e96aadeed80b7e4e803f2332b
font_02_sfnt_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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